DIFPACK

Gatan DIFPACK (Diffraction Analysis Package) is an offline software package designed to automate the analysis of selected area electron diffraction (SAED) patterns and high resolution lattice images of crystalline samples. The software provides simple and accurate measurements of lattice spacings and the angle between two sets of lattice planes.

DIFPACK software automatically keeps track of all measurements in different images and provides output which can be easily exported to any word processor or plotting applications.

Specifications

Accurate peak location

Automatic peak search and refinement to sub-pixel accuracy through the use of center of mass calculation (for diffraction patterns) and interpolation (for diffractograms) to provide maximum accuracy.

Improved diffractogram

The calculation of the diffractogram of a lattice image is preceded by masking in real-space to eliminate streaking and improve measurement accuracy.

Optimized calibration

Calibrations are automatically transferred between image and its diffractogram.

Center location

The center of diffraction pattern can be automatically located using a cross-correlation technique (for centro-symmetrical patterns) or be determined manually from a pair of spots located symmetrically about the central spot.

Background thresholding

Background noise can be automatically distinguished from dim spots through the use of an empirically determined threshold parameter.